Any good trainer is invested in the health and fitness of his or her trainees. But the trainers on The Biggest Loser have even more at stake.

For one thing, their results will be witnessed by millions of viewers.

For another, unlike a personal trainer in the real world, who may only see his or her client every few days, the trainers on The Biggest Loser, as Kim Lyons recently said, they're “there with them every single step of the way.”

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Kim has a new book coming out in January called Your Body, Your Life, and she recently told OK Magazine that this gives her a “unique perspective” on the emotional and psychological ramifications of undertaking such a massive life-overhaul, and how this helped her write her book.

She said, “I can see how emotionally draining it is on them, and they can run from me and cry to somebody. They're going to have to work through that with me. Something that I could completely apply to the book is just trying to make people feel comfortable with their emotions about weight loss issues.”

In keeping with that focus on the emotional aspect of weight loss, she says she lets her clients' personalities help inform how she trains them. “You have to pick out what makes them tick and drive on that…So you kind of have to find what style works with each individual person.”

She also admitted she does not always see eye-to-eye with the other The Biggest Loser trainers' methods. “There are certain things that you think, ‘Oh, that's really great,' and there are other things that just aren't my style. I just don't agree with someone who is 400 pounds on a treadmill on day two of a workout and having them run at 12 miles an hour. There are definitely a few conflicts, but in the end the results are there, so that's what matters."